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A delivery truck covers 240 km in 6 hours. If it drives 25% slower on mountain roads, how long to cover 300 km (120 flat + 180 mountain)?

Correct answer: C. 9 hours

  • A. 8 hours
  • B. 8.5 hours
  • C. 9 hours
  • D. 9.5 hours

Explanation

The truck travels at 40 km/h on flat roads (240 km in 6 hours). On mountain roads, its speed is reduced by 25%, resulting in a speed of 30 km/h.To cover 120 km on flat roads, the time taken is 120 km / 40 km/h = 3 hours.For 180 km on mountain roads, the time taken is 180 km / 30 km/h = 6 hours.The total time is 3 hours + 6 hours = 9 hours, making Option C the correct choice.Options A and B underestimate the time by not fully accounting for the speed reduction, while Option D overestimates it due to incorrect assumptions about speed adjustments.

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